Checks themes versions only after a duration of time.

Description

This is for performance reasons to make sure that on the theme version checker is not run on every page load.

Source

function _maybe_update_themes() {
	$current = get_site_transient( 'update_themes' );

	if ( isset( $current->last_checked )
		&& 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked )
	) {
		return;
	}

	wp_update_themes();
}

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